Internal-combustion engine.



L. L- FOSTER.

PNTERN-Al. comsusTlow ENGINE. APPLICATION FILED SEPT. 13, 1917- Patented Feb. 5,1918.

5 SHEETS-SHEET I. 6

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L. L. FOSTER.

INTERNAL COMBUSTION ENGINE.

APPLICATFON FILED SEPT. 1.3. 19!].

1 955,730, Patented Feb. 5,1918.

5 SHEETS-SHEET 2.

L. L. FQSTER. INTERNAL comausnou' ENGINE.

I APPLICATION FILED SEPT. 13. I917. I 1,255,730. Patented Feb. 5,1918.

5 SHEETS-SHEET 3.

' auioznags,

L. L. F USTER. INTERNAL COMBUSTION ENGINE.

Patented Feb. 5, 1918.

5 SHEETS-SHEET 4 e. L. FOSTER. I INTERNAL COMBUSTION ENGINE.

APPLICATION FILED SEPT. I3, 1911. 1,255,730. Patented Feb. 5,1918.

5 SHEETSSHEET 5.

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BEST AVAILABLE com" STATES PATENT orricn.

LEWIS n rosrnn, or sevens, MARYLAND, assieiion or own-Henr 'ro JOHN E.- nunnmtmaor naooxmn, new YQBK.

\ I all whom it may concern:

'Be it known that I, LEWIS L. Fos'rnn, a

citizen of" the United States, residing at Govans, in the county of Baltimore and 'State of Maryland, have. invented certain 7 new andusefullmprovements in Internal- Combustion Engines, of which the followis a specification.

' v his invention relates to an improved in ternal combustion-engine and has as its primary object to rovide a construction wherein a firing stro e of the piston will occur at each half revolution of the engine crank the said piston;

The invention has asa further, 0b]ect to shaft so that there will be no idle stroke of.

" provide a construction wherein the engine will be fired at each side of the piston so that the; piston will thus be propelled in its movement in opposite directions.

A still .further object of the invention is to provide an arrangement wherein complechambers. of theengine.

mental compression chambers will be employed' forcompressing the fuel'mixture prior to its intrqductioninto the ignition The invention has as a further object to provide a construction wherein the intake and exhaust of the engine will be controlled by a single sleeve valve movable with the PlStOIlOf the engine.

. ;A further ob ect of the invention is to provide an arrangement wherein the cylinifely. long connecting rods to thus minimize the'latiiral or side thrust of the piston ,upon

' the working cylinder of the engine.

- as the description proceeds and in the draw Other and incidental objects will appear ings wherein I have illustrated the preferred embodiment of the invention and wherein similar reference characters designate corresponding parts throughout the several views:

Figure '1 is a fragmentary vertical sec tional view of my improvedengine showing the. )lStOIl at the top of its stroke, F1 2 is a similar view showing the plston at, bottom of its stroke,

Specification of Letters remit,

INTERNAL-COMBUSTION" ENGINE. I

Patented 5, 1918.

Application filed September 13, 1917. Serial No. 191,288.

Fig. 3 is a fragmentary sectional view showing the piston in posltion for exhaust of the upper firing chamber of the engine,

Fig. 4 is a detail perspective view of the working cylinder of the engine and showing the spider employed for supporting the said cylinder upon the outer cylinder or casing Of'the engine,

Fig; 5 is a vertical sectional view taken on the line 5-5 of Fig. 2 and looking in the direction of the arrows, this view showing the manner'in whichthe piston is connected with the engine crank shaft as well mounting of the said shaft,

Fig. 6 1s a transverse sectional. view taken on the line 6-6 of Fig. 2-and looking in the direction of the arrows, this view showing the mounting'of the sp1der which supports the working cylinder of the engine,

Fig. 7 is a transverse sectional view taken on the line 77 of Fig. 2 and looking in the direction of the arrows, this view particularly showing the arrangement of the port as the g employed for supplying oilto the engine piston, and

Fig. 8 is a transverse sectional view taken on the line 88 of Fig. 2 and particularly showing the intake port of the upper firing chamber of the engine as well as the exhaust" port of the engine.

In carrying out the invention, my im- 1 which, as usual, is Preferably'construeted proved engine is formed with av crank case in sections bolted or otherwise secured together. Journaled within the crank case is the engine crank shaft 11 provided with complemental cranks 12 which extendin the same direction. The shaft is equippedat one end with a suitable fly wheel 13. Mounted upon the 'crank case is the fixed outer cylinder or casing 14 of the engine. This cylinder is'open at its ends and at its lower extremity is, provided with an annular flange 15 to which is connected a bottom plate or cap 16 closing the adjacent end of the said cylinder and seating against the crank case 10. Extending through the said flange to connect the plate 16 thereto as vtell as to secure the cylinder 14 to the crank case are a plurality of bolts or other suitable fastening devices 17. As particularly shown in Fig. 2 of the drawings, the crank case is, be-

neath the plate 16, provided with a suitable opening and projecting from the said plate itening devices through this opening is an arm or web 18 provided at its lower extremity with a bearin 19 to support the crank shaft 11.

Suspended within the upper extremity of the outer cylinder 14 "axially thereof is a working cylinder 20 which is also open at its ends. The cylinder 20 is provided with a water jacket 21 connected with the said cylinder at opposite sides thereof by vertical webs 22 which, as particularly shown in Figs. 2 and 5 of the drawings, terminate in spaced relation to the lower end of the said water jacket. The purpose of these webs will presently appear. Closing the lower extremity of the cylinder 20 is a removable end cap 23 preferably screw threaded upon the said cylinder. Screw threaded into the upper extremity of the cylinder is a. hollow packing cylinder or plug 2 L formed at its upper end with a lateral annular flange 25 overlying the water jacket 21.to close the adjacent end thereof. The plug 24: is provided with an axial sleeve 26 terminating at its upper extremity in an extension 27 upon which is screw'threaded a spider 28. Locking the spider upon the said extension are a plurality of bolts or other suitable fas- 29. The spider 28 is, as shown in detail in Fig. 4 of the drawings, preferably provided with quadrantly spaced radial arms 30 which overhang the 11 per extremity of the outer cylinder i l an at their outer ends, seat upon an annular flange 31 projecting laterally from the adjacent end of the said cylinder. Securing the arms to the said flange are bolts or other suitable fastening devices 32. As will now be clear,

the spider 28 will thus rigidly support the working cylinder 20 of the engine within the outer cylinder lat thereof.

Snugly fitting between the outer cylinder 14 and the inner cylinder 20 to surround the water jacket of the said inner cylinder is a slidably mounted sleeve valve or cylinder 33. This cylinder is, as particularly shown in Fig. 2 and similar sectional views of the draw1ngs,.prov1ded with longitudinally extending slots 3% which slidably receive the arms 30 of the spider 28. The spider arms therefore serve to hold the cylinder 33 against rotation. Closing the lower end of the said cylinder is a removable end .cap 35 preferably screw threaded into the said cylinder and similarly connected with the upper end of the cylinder is a removable end cap or head 36. Secured to this head for movement with the cylinder 33 is a piston 37 slidably fitting within the workin cylinder 20 of the engine. The rod 38 0% this piston is slidably received through the sleeve 26 of the packing cylinder or plug and, at its upper extremity, is screw threaded into a boss 39 formed akiallyupon the inner side of the head 36 for thus detachably connecting the said piston with the '24:and communicates with the up of the packing cylinder 24:. This provides an effective arrangement for forming a tight oint between the piston rod and the said cylinder and a construction eliminating the use of a stutiin box.

Formed on tl ie outer side of the head 36 of the cylinder 21, are spaced half-bearing blocks 4:2 with which are arranged to coact half-bearings 4:3 for receiving a cross pin 44. This pin is, as particularly shown in Fi 5 of the drawings, held against longitu inal movement by spaced collars 45 arranged to abut the bearings of the head and detachably connected to the extremities of the said pin are connecting rods 46 which project through suitable openings 47 in the crank case and are secured to the cranks 12 of the crank shaft 11. Reciprocation of the piston 37 will thus act to reciprocate the cylinder or sleeve valve 33 and consequently actuate the connecting rods 46 to turn the crank shaft 11. In this connection, attention is directed to the fact that by the arrangement shown, relatively long connecting rods are employed to consequently minimize the lateral or side thrust of the piston against the walls of the working cylinder 20 of the engine. site sides of the openings 47, formed with parallel under cut flanges 48 engaging with, the said flanges to close the said openings are plates 49 through which the connecting rods 46 are loosely fitted.

The plates 49 Wlll therefore slide upon the same flanges as the connecting rods move arm 30 of the spider 28 as well as through.

the flange 25 of the packing cylinder or plug er extremity of the water jacket 21 at t side of the jacket. Communicating igi a similar manner with the upper extremity of the water jacket at its opposite side, is an outlet pipe 51 which is carried throughthe slot 34 of the cylinder '33 diametrically op-' posite the slot receiving the pipe 50. .The

and slidably e said The crank case is, at oppopipes 50 and 51 may be connected with any suitable circulating system and as will now be observed, the water will be introduced into the water jacket at one side of the webs 28 of the said jacketand will be carried from the jacket at the opposite sides of the said webs. The function of these webs, previously referred to, now therefore becomes apparent, since. it will be seen that said webs will cause the water within the water 30 with an internal slot or'transfer passage 57 assT AvAaesLE jacket to circulate the full length thereof in order that the water may flow from the pipe discharged at the pipe 51. Efi'ective coolinfi chamber is provided within the worklng cylinder 20 at each side of the piston 37 and,

for convenlence, such firing chambers have been indicated at 52 and 53 respectively, the

chamber.

chamber 52 being the lower firing chamber and the chamber 53 being the up er firing Furthermore, it will e noted that a chamber 54 is provided within the -outercylinder 14 below the lower end of the cylinder 33 and that a second chamber 55 is provided within the lower extremity of L the cylinder 33 below the adjacent. end of the working cylinder 20. These chambers 54 and 55 constitute, as shall presently ap pear, compression chambers for the fuel mixture. At its lower extremity, the outer cylinder 14 is,'at the adjacent side thereof,

formed to provide a transfer passage 56 leading from the lower end of the chamber 54 andentering through the cylinder to communicate with the upper firing chamber 53, The wall of the cylinder 33 is, at the lower end of the said cylinder, provided arranged at the side of the said cylinder lopposite the assage 56and adapted to communicate wit a passage 58 formed through the "wall of the working cylinder 20 at the flowerend of the firing chamber 52. The

chamber 54thus forms a'compression chamber for .theiupper firing chamber 53, while the cl ia jneberv forms a compression cham- 'the lower firing chamber 52. In this ion,fit.yvill be noted that .the presence isto'n rod;'38 within the upper firing will. eause the cubic volume of the be somewhat less than that of the'.;lower. :ffiring;chamber 52. Accordingly, .thilarger' oompres'sion chamber 54 is arranged to .communicatewith the upper firing chamberiiiorder that a greater volume offueL-mixture may be introduced into 150 atopposite sides-of the piston. In order to further enhance this effect, the lower end I the saidi'chamber for equalizing the impulse 1 of the packing cylinder or plug 24 is, as particularly shown in Fig." 2 and other similar ,55

figures of the drawings,'-pro'vided with a channelediface to accordingly increase the cubic volume: of .thesaid .chambenqa v Thepassage 58 in theg -lower end of the v, r working .cyhnderj20, extends-through the 160w "ceives a spark plug, as conventionally shown emercylinder Ilffandfat itsouterend, re-

' at '59, the plug being screw threaded into thecylinder 14. "Formed through this cylinderj'as 'wellas 'the working cylinder 20 at a point above thepassage' 58. is a passage 60 cos 'communicating' 'with the upper firing chamber 53. Screw threaded upon the cylinder 14 in the outer end of the said passage is a spark plug, asconventionally shown at 61. Formed through the said cylinder at a point midway between the passages 58 and 60, is

an exhaust passage 62 in the outer end of which is fitted an exhaust pipe 63 screw threaded upon the cylinder 14. As shown in Figs. 7 and 8 of the drawings, the ortions of-the passages 56,160 and 62 w ich as anypacking lrings of the cylinder 33 moving over the passages, cannot sprin into engagement with the walls thereo The passage 58 is provided with a similar web; Formed in the cylinder 14 at. a point below the passage 58 ,is an intake passage 64 with which may beconnected a suitable carbureter, as conventionally illustrated at 65. The passages 58 ranged in vertical alinement. Formed in oneside of the cylinder 33adjacent its lower extremity is an intake passage 66. The adjacent side ofthis cylinder is further provided with vertically spaced passages 67 and 68 respectively. The passages 66, 67 and 68 are also arranged in vertical alinement and in the same verticaLplane with the passages 58, '60, 62 and 64 of the cylinders 14 and 20.

Formed in the cylinder 33 at the side thereof opposite the passage 62 is an intake passage 69. p 1 It will now be assumed that a charge of fuelmixture has been introduced into the V 152 will be fired by the.- 1ug'59'rtO. drive the.

piston upwardly. Ast piston thus moves upwardly, the passage 7 fwill'be brought into register with'the exhaust passage 62 to exhaust the fired charge from the. said cham- .ber. Sincethe valve 33 is arranged-to move with the piston, it will be observed that as v 60, 62 and 64 are arthe said valve thus movesupwardly with the piston that a partial vacuum will be created by the valve within the compression chamber 54... Consequently, .as, soon as the lower end oisaid awalve passes over. the intake passage-64'; asfshown in Fig; 1, a charge rbffuelmixture will. be drawn into the said compression chamber-from the carburetor 65. After the piston has reached the top of its stroke ready to start downwardly, as 5 shown in Fig. 1, it will be further assumed that a chargeof fuel mixture has been introduced into the firin chamber 53. The passage '68 of the cylin or 33 being then in register with the passage 60, the said charge will be fired by the plug 61 to drive the piston downwardly. Downward movement of the said piston will then shift the passage 68 into register with the exhaust passage 6:2, as shown in Fig. 3, for exhausting the upper firing chamber. The passage 67 will therefore provide a spark and exhaust port for the lower firing chamber 52 while the passage 68 will provide a spark and exhaust port for the upper firing chamber 53. Downward movement of the valve 33 with the piston 3'? will cause the said valve to compress within the chamber 54 the charge of fuel mixture therein so that this valve thus also provides a compression cylinder. Such compressed charge will be held within the said chamber until the valve 33 has reached the bottom of its stroke, as shown in Fig. 2, when the intake passage 69 of the said valve for the upper firing chamber will be brought into register with the passage 56. T he compressed charge will then be forced through this passage 56 into the upper firing chamber. Downward movement ofthe valve 33 will also cause the creation of a partial vacuum within the compression chamber- This partial "acuum will continue i exist until the valve has reached the bottom its stroke, when the 1ntake passage (3tthe said valve Will be brought into register with the passage G-il so that a charge of fuel mixture will then be drawn in through the said passages into the said.

chamber. As the piston 31 again moves upwardly, the charge of fuel mixture in the upper firing chamber will be compressed-by the piston. At the same time the charge of fuel mixture within the compression chamber 55 will be compressed by the valve 33. Movement of the pistd'n to the top of its stroke will then bring the slot 57 of the valve 33 into communication with the intake passage 58 of the lower firing chamber 52, as shown in Fig. 1, when the compressed charge of fuel mixture within the compression chamber 55 will be forced into the said firing chamber. The charge of fuel mixture in the upper firing chamber will then, as previously described, be fired for driving the piston downwardly and comressing the charge of fuel mixture drawn into the lower firing chamber 52, aswell as the charge of fuel mixture drawn into the compression chamber 54.

It will therefore be seen that each time a charge is fired in the lower firing chamber 52 to drive the piston upwardly, a charge of fuel mixture will be drawn into the compression chamber 54, a second charge of fuel mixture will be compressed within the compression chamber 55 and that a third charge of fuelmixture will be compressed within the upper firing chamber 58. In like manner, each time a charge is fired in the upper firing chamber to drive the pistog downwardly, a charge of fuel mixture will be drawn into the compression chamber t'uj, a second charge of fuelmixture will be compressed within the compression chamber 5% and a third charge of fuel mixture will be compressed within the firing chamber 52.

ton. A maximum of energy will accordingly be developed by the engine.

Leading through the outer cylinder 14 into the working cylinder 20 of the engine is, as shown in detailin Fig. 7,1111 oil passage 70 in the outer! end of which is fitted ah oil pipe 71 from a suitable lubricating tank. The cylinder 33 is, as shown in dotted lines in Fig. 7, provided with apassage 72- arranged in a horizontal plane with the piston 37 and adapted to be brought into register with the passage 70. when the piston moves upwardly to the top of its stroke. Consequently, in this'position of the piston,

lubricant will be introduced through the passages 70- and 72 against the said piston each tim'ethe piston travels upwardly, for effectively lubricating the piston.

It will'therefore-be seen that I provide a particularly effective construction for the purpose set forth and in this connection attention is directed to the fact that the piston of the engine may be removed at any time desired by simply displacing the h...;.d 36 of the sleeve valveor cylinder when the packing cylinder or plug 24: may be removed for displacing said piston. Also, the working cylinder of the engine may, in like manner, be removed at any time desired while access may be had to the compression down here of the engine by simply removing the cap plates of the outer engine cylinder and sleeve valve.

Having thus described the invention, what is claimed as new is:

1. An internal combustion engine including an outer cylinder, a working cylinder ing an outerl, cylinder, a working cylinder,

- ports and and closing said ports.

Z, .An internal combust on engine includsupported therein, a piston mounted to reciprocate within the working cylinder, the said working cylinder-- providing firing chambers at opposite sides of said piston, intake and exhaust ports for the saidchambers, a sleeve valve mounted to slide between the said cylinders for opening and closing said ports, and a head carried by the said valve and connecting the piston therewith.

3. An internal combustion engine including a crank shaft, an outer cylinder, a working cylinder supported therein, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing" chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, a sleeve valve connected with the piston and mounted to slide between the ports, and a connection between thesaid ing cylinder supported therein, a piston mounted to reciprocate within theiworking cylinder, the working cylinder i p'roviding firing chambers at opposite sides .ofysaid piston, intake and exhaust ports-forthe said chambers, a sleeve valve mounted fto slide between the said cylinders for opening and closing said ports, a head carried .by said pin and the sai crank shaft.

the

providing firing chambers at opposite sides of said piston, Intake and exhaust-ports for the said chambers. and a sleeve valve mounted to move with the piston between the said cylinders for opening and closing the-said loosely receiving the arms of said spider.

.6. An internal combustion engine includ theworking cylinder, a piston mounted'to reciprocate within the working-cylinder and.

having the rod thereof slidably received through said plug, the working cylinder providing firing chambers at opposite sides of the said piston, intake and exhaust ports "for the said chambers, and a sleeve valve to slide between the said cylinders for opening an. outer cylinder, 1 working cylinder arranged therein, a packing plug closing the workin'g .cylinder,'a spider connectedito said said cylinders for opening and closing said i 20 valve and the said crank shaft.-

. 4; An internal combustion engine including a crank shaft, an outer cylinder, a working an outer cylinder, a working cylinder 1 1 supported therein, a packing. plug closing connected with the piston rod and mounted.

plug and having arms overhanging said i1 cyhnder for supporting the working .cylin-- der in position,a piston mounted to rec pro cate within the working cylinder andhavin a piston rod slidably received through sai plug,the working cylinder chambers at opposite sides 0 providing firing y said'piston,in-

take and exhaust ports for the said chambers, and a sleeve valve connected with the plston rod and mounted to slide between the said cylinders for opening and closing said i ports, the said valve being provided with slots loosely receiving the arms of said spider. v f

8. An internalcombustion engine including an outer cylinder, a workin cylinder arranged therein and surrounded y a water jacket, a piston mounted to reciprocate within the working cylinder, the working cylinchambers at op 'osite der providing firingof sai piston, intake' and ex austsides ports for the said, chambers, a 'sleeve valve connected with the piston and surrounding the said water jacket to slide within the outer, cylinder for opening and closing said ports, and circulating pi es for the water jatiket operatively receive 7 through the said va ve.

9. An internal combustion engine includ-.

ing an outer cylinder, a working cylinder arranged, therein, a water jacket surround closing the working cylinder. and provided ,ing the workingcylinder, a packing plug with a flange closingthe said water jacket,

a piston mounted to reciprocate within the working cylinder and having a piston rod slidably received through said plug, the

working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, and a sleeve valve connected with the piston rod and surrounding said water jacket toslide within the outer .cylinderfor opening and" closing saidports.

10. An internal combustion engine incite ing an outercylinder, a working cylinder arranged therein, a waterjacket surrounding the working cylinder, a piston mounted to reciprocate within the ,worklng cylinder,

the working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, .a I spider having arms overhanging the outer cylinder and connected with the working cylinder for supporting the working cylinder in position", a sleeve valve connected with the piston and surrounding the said water jacket to slide within the outer cylinderjior opening and closing said ports, thesaid valve being provided with slots receiving the varms of saidspider, and circulating pipes for the water jacket received through said slots.

11. An internal combustionengine includo ing an outer cylinder, a working cylinder supported therein, a piston mounted to reciprocate within the working cylinder, the working cylinder providing ifiring chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, a sleeve valve connected with the piston and mounted to slide between the said cylinders for opening and closing said ports, the sleeve valve coacting with the cylinders to provide compression chambers and being movable to establish communication between the said chambers and the intake ports of the said firing chambers respectively, and an intake port for the said compression chambers, the sleeve valve being also operable to establish communication between the said last-mentioned intake port and the compression chambers. i

12. An internal combustion engine including an outer cylinder, at working cylinder supported therein, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, a sleeve valve connected with the piston and mounted to slide between the said cylinders for opening and closing the said ports, the said valve cooperating with the cylinders to provide compression chambers and being movable to establish communication between the said compression chambers and the intake ports of the firing chambers, and an intake port for said compression chambers, the said valve being movable to selectively establish communication between the said last-mentioned intake port and the said compression chambers and to selectively draw in a fuel charge through the said last-mentionedport into the said compression chambers. 13. An internal combustion engine including an outer cylinder, a working cylinder supported therein, a piston mounted to reciprocate Within the working cylinder, the working cylinder providlng firing chambers at opposite sides of said piston, intake ports for the said chambers, a common exhaust port for the said chambers, firing ports for the said chambers, and a sleeve valve connected with the piston and mounted to slide between the said cylinders'for opening and closing said ports.

14 An internal combustion engine in cluding an outer cylinder, a working cylinder supported therein, a plston mounted to reciprocate within the working vcylinder, the

working cylinder providing firing chambers at opposite sides of said'piston, intake and H exhaust ports for the said chambers, a sleeve valve connected with the piston and mounted to slide between the said cylinders for opening and closing said ports, the sleeve valve coiiperating w th the cylinders to provide compression chambers, and an intake port for the said' chambers. thegleeve valve asagna,

said compression chambers through the said last-mentioned intake port.

15. An internal combustion engine including an outer cylinder, at working cylinder supported therein, .a packing cylinder closing the working cylinder and formed with an axial sleeve, a piston mounted to reciprocate within the working cylinder and having a piston rod slidably received through said sleeve, means carried by the piston rod for engagement within the sleeve to provide a sealed joint between the rod and the sleeve, the working cylinderproviding firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, and a sleeve valve connected with the piston rod and mounted to slide between the said cylinders for opening and closing said ports.

16. An internal eluding a Working cylinder, a cylinder surrounding the working cylinder, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, and a sleeve valve mounted to move between the said cylinders for opening and closing said ports.

17. Aninternal combustion engine including a working cylinder, a cylinder surrounding the working cylinder, a crank combustion engine in shaft, a sleeve valve mounted to move between. the said cylinders, and a piston mounted to reciprocate within the working cylinder and connected through said valve with the crank shaft, the working cylinder providing firing chambers at'opposite sides oflthe piston opened and closed by the said va ve.

18. An internal combustion engine including a crank shaft, a working cylinder,

a cylinder surrounding the working cylin 19, An internal combustion engine i cluding a crank shaft, a working cylinder, {a cylinder surrounding the working cylinder, at piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the said chambers, a sleeve valve connected with the piston and mounted to move between the said cylinders for opening and closing said ports, and connecting means betweenthe said valve and the crank shaft extending at said chambers, intake and exhaust ports for the chambers, a sleeve valve mounted to move between the cylinders for opening and closing said ports and cooperating with the said cylinders to provide a compression chamber exteriorly of the valve and adapted to communicate with the said firing chamher and a compression chamber interiorly of the valve and adapted to communicate with the other of the firing chambers.

21. An internal combustion engine including aworking cylinder, a cylinder surrounding the Working cylinder, a piston mounted to reciprocate within the working cylinder,

the working cylinder providing firing chain-- bersat opposite sides ot'said piston, intake and exhaust ports for the sald chambers, and a sleeve valve mounted to move between the said cylinders for opening and closing said ports to permit the introduction of a fuel charge into One of the chambers and the compression of a fuel charge in the other of said chambers at each stroke of the piston.

22. An internal combustion engine including a working cylinder, a cylinder urrounding the Working cylinder, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, exhaust ports'for the said chambers, a sleeve valve mounted to move between the said cylinders and cooperating therewith to provide compression chambers, intake ports from the compression chambers to the firing chambers, and an intake port for the said compression chambers, the valve being movable to open and close said ports and to draw in fuel charge into one of the compression chambers and compress a fuel charge in the other of the compression chambers at each stroke of the piston;

23. An internal combustion engine including a working cylinder, a cylinder surrounding the working cylinder, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, exhaust ports for the firing chambers,asleeve valve mounted to move between the cylinders and cooperating therewith to provide compression chambers, an intake port for the compression chambers, and intak ports to the firing chambers from the said compression chambers, the valve being movable for con trolling said ports to permit the introduction of a fuel charge into one of the firing chams bers from one of the compression chambers and the compression of a fuel charge in the other of the firing chambers at each stroke of the piston.

24. An internal combustion engine including a working cylinder, a cylinder surrounding the working cylinder, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, exhaust ports for the firing chambers, asleeve valve mounted to move between the cylinders and cooperating therewith to provide compression chambers, an intake port for the compression chambers, and intake ports to the firing chambers from the said compression chambers, the valve being movable for controlling said ports to permit the introduction of a fuel charge into one of the firing chambers from one of the compression chambers and the compression of a fuel charge in the other'of the firing chambers as well as to draw in a fuel charge into one of the compression chambers and compress a fuel charge in the other of the compression chambers at each stroke of the piston. A

25. An internal combustion engine including aworkin cylinder, a cylinder surrounding the working cylinder, a piston mounted to reciprocate within the working cylinder, the working cylinder providing firing chambers at opposite sides of said piston, intake and exhaust ports for the firing chambers, and a single sleeve valve mounted to move between the cylinders for opening and closing said ports and cooperating with the cylinders to provide compression chambers adapted to communicate with the firing chambers through said intake ports and havin such communication controlled by the valve.

Tn testimony whereof I affix my signature. 

